What convinced inca armies to retreat in their war against the spanish in 1533?
the spanish captured their emperor.
the spanish executed their emperor.
the spanish captured their capital city.
the spanish joined forces with native groups.

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.